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diff --git a/plugingui/canvas.h b/plugingui/canvas.h
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+++ b/plugingui/canvas.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            canvas.h
+ *
+ *  Sun Sep  4 13:03:51 CEST 2016
+ *  Copyright 2016 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include "pixelbuffer.h"
+
+namespace GUI
+{
+
+//! Abstract class that can be used by the Paiter to draw on.
+class Canvas
+{
+public:
+	//! @returns a reference to the pixel buffer.
+	virtual PixelBufferAlpha& GetPixelBuffer() = 0;
+
+	//! Signal the beginning of a paint operation.
+	virtual void beginPaint() = 0;
+
+	//! Signal the ending of a paint operation
+	//! This might trigger a redraw operation.
+	virtual void endPaint() = 0;
+
+};
+
+} // GUI::